forked from Minki/linux
0eef89403e
The bitstream reader needs 512 bytes ready to read to examine the headers in the first frame. If that frame is too small, prepend it with a filler NAL. Signed-off-by: Philipp Zabel <p.zabel@pengutronix.de> Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com> Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
51 lines
1.0 KiB
C
51 lines
1.0 KiB
C
/*
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* Coda multi-standard codec IP - H.264 helper functions
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*
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* Copyright (C) 2012 Vista Silicon S.L.
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* Javier Martin, <javier.martin@vista-silicon.com>
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* Xavier Duret
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*/
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#include <linux/kernel.h>
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#include <linux/string.h>
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#include <coda.h>
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static const u8 coda_filler_size[8] = { 0, 7, 14, 13, 12, 11, 10, 9 };
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int coda_h264_filler_nal(int size, char *p)
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{
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if (size < 6)
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return -EINVAL;
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p[0] = 0x00;
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p[1] = 0x00;
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p[2] = 0x00;
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p[3] = 0x01;
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p[4] = 0x0c;
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memset(p + 5, 0xff, size - 6);
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/* Add rbsp stop bit and trailing at the end */
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p[size - 1] = 0x80;
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return 0;
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}
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int coda_h264_padding(int size, char *p)
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{
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int nal_size;
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int diff;
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diff = size - (size & ~0x7);
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if (diff == 0)
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return 0;
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nal_size = coda_filler_size[diff];
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coda_h264_filler_nal(nal_size, p);
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return nal_size;
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}
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